A Boat Moves Through the Water in a River at a Speed

Multiple Choice

A boat moves through the water in a river at a speed of 8 m/s relative to the water.The boat makes a trip downstream and then makes a return trip upstream to the original starting place.Which trip takes longer?

A) the downstream trip
B) the upstream trip
C) Both trips take the same amount of time.
D) The answer cannot be figured without knowing the speed of the river flow.